(function (draftWidth, n) {
  function getRem() {
   var html = document.querySelector("html");
   var w = document.body.clientWidth || document.documentElement.clientWidth;
   var rem = (w / draftWidth) * n;
   html.style.fontSize = rem + "px";
  }
  getRem();
  window.addEventListener("resize", function () {
   getRem();
  });
 })(1366, 100);